Lock-washer-making machine



F. KESSEL. LOCK WASHER MAKING MACHINE. APPLICATION FILED 02c. 13. 1916.

Patenmd May 4, 192() 3 SHEETS-SHEET I.

. WITNESS i INVENTOR, M ii:- Wank lfessel Z 13W v ATTORNEY F. KESSEL. LOCK WASH'ER MAKING MACHINE.

APPLICATION FILED DEC-18, 1916.

1,338,737, I Patented May"4, 1920.

3 SHEETSSH EET 2.

, INVENTOR.

Wow/f fiesseL WITNESS A TTO RNE Y F. KESSEL.

LOCKWASHER MAKING MACHINE. APPLICATION FILED DEC. 18. 1916.

1,338,737. I Patented'May 4,1920,

fa SHEETS-SHEET 3.

WITNESS Fr'an Kessel WATTORNEY nnrrnn sTATEs PATENT OFFICE.

FRANK KESSEL, OF MANSFIELD, OI-IIQ, ASSIGNOR T0 THE MANSFIELD LOOK WASHER COMPANY, OF MANSFIELD, OHIQ A GORPORA'IION.

LOCK-WASHER-MAKING MACHINE.

To all whom it may concern:

Be it known that I, FRANK KnssEL, a citizen of the United States, residing at Mansfield, in the county of Richland and State of Ohio, have invented certain new useful Improvements inLock-Washer-Making Machines, of which the following is a specification.

The invention relates to machines for forming spring lock washers, of the type including a coil forming device, means for feeding a metallic rod or bar into the coil forming device, and means for severing the coiled bar at periodic intervals to form washers.

In machines of this general type, a reciprocating tool has been employed for squarely severing the completed washers, so that an intermittent feeding of the metallic bar has been required for permitting the return movement of the cutting tool in the periodic severing operation. This intermittent feeding operation not only necessitates complicated operating mechanism but also involves great wear and tear on the parts and con sumes considerable time in the operation of the machine.

The principal object of'the present improvement is to provide a continuously progressing cutter which will operate periodically to squarely sever the completed washers without interfering with a continuous feeding of the blank metallic stock or bar from which the washers are formed. 7

A further object of the improvement is to provide means for continuously feeding the metallic bar into the coil forming device at a uniform speed, and which may be thrown from an operative to an inoperative position and vice versa, without varying the relative fixed arrangementof the parts.

The objects of the invention'thus generally stated, together with other and ancillary advantages, are attained by the construction and arrangement illustrated inthe accompanying drawings forming part hereof. in which- Figure 1 is a side elevation of the machine; Fig. 2, a top plan View of the machine, a portion of the fly-wheel being broken away to show a detail of construction;

Specification of Letters Patent.

Patented May 4, 1920.

Application filed December 18, 1916. Serial No. 137,701.

Fig. 3, a perspective view showing the manner of movably mounting one of the feed roller shafts; V

Fig. 4, a front end view of the machine;

Fig. 5, an enlarged fragmentary side elevation of the severing mechanism;

Fig. 6, a fragmentary perspective view showing the coil forming means and a completed severed Washer;

Fig. 7, a detail perspective view of the coil forming die; and I Fig. 8, a fragmentary detailview showing the bar coiled upon the end of the mandrel.

Similar numerals refer to similar parts throughout the drawings.

The machine includes the base or frame 1 having at one end a drive shaft 2 mounted to rotate in bearings 3 carried by the frame, and having a drive pulley at at one end and an arm 5 at itsother end, in the free end of which arm is adjustably mounted a cutting tool or blade 6;- and at the other end of the frame a pair of driven shafts 7 and 7 are rotatably mounted and provided with gear wheels keyed on one end and forming part of a train of gears 8 by which said shafts are geared to the drive shaft 2, and with feed rollers 9 and 9 keyed on the other ends adapted to feed a metallic bar from which the washers are formed through guide blocks 10 into a coil forming die 11 having a fixed mandrel 12 therein, said guiding and coiling means being suitably mounted on the frame substantially midway between the drive shaft 2 and the driven shafts 7 and 7; and the mandrel 12 being substantially parallel with said shafts.

Thedriven shaft 7 having the upper feed roller 9 fixed thereon is eccentrically journaled in a sleeve or bearing member 13 which in turn is journaled at its opposite ends in bearings 14 formed on the frame; and fixed on the sleeve 13 concentrically therewith is a collar 15 having a lever arm 16 formed integrally therewith.

I Thelower feed roller 9 is-provided in its periphery with a groove 9 of a depth slightly less than the thickness of the metallic bar and preferably of keystone shape; and on the free end of the lever a Weight 17 is suspended for maintaining the feed rollers in operative position.

These parts are so proportioned and arranged that a downward rearward movement of the lever from an upright position will move the upper roller 9 toward the lower roller to impinge a bar entered between the rollers, to feed it into the coil forming device, the weight on the free end of the lever being of a size to cause the rollers to exert a sufiicient pressure upon the bar for properly feeding the same when in normal operative position. By this construction it will be evident that after the initial adjustment of the parts, the upper feed roller may be swung into engagement with the bar inserted between the rollers without making any further adjustment of the parts, and when in such position will exert a uniform pressure upon the bar to cause it to be properly fed into the coil forming device;

The guide blocks 10 are mounted one on top of the other and are adjustably secured in a cut-away portion or groove in the side of the frame 1 as by means of bolts 18 and 18 The lower block is provided with a guide groove 19 which is bridged by the upper block to form a longitudinal guideway into which the bar enters upon leaving the feed rollers and from which it is directed into the coiling means. The guide groove 19 is in a line radiating from the drive shaft 2, so that the cutting edge of the tool 6 travels squarely across the path of the metallic bar as it is coiled upon the mandrel.

The coil-forming die is formed from a substantially rectangular fixed block which is secured to the frame in a cut-away portion or groove, and slightly rearward of the 7 guide blocks, as by means of a binding screw 20. Said-block is provided in its forward end with a semi-circular recess in its outer face which forms a forming socket 21, and-the inner wall of the recess is provided with an opening 22 therein of slightly less diameter than the recess through which the outer end of the mandrel 12 is adapted to extend transversely thereof; and on the outer face of the block at the upper forward end thereof a guide plate 23, having an out wardly and upwardly beveled face is secured as by means of a bolt 24.

The plate 23 serves to form between it and the inner wall of the recess a channel groove which is alined with the guideway in the guide blocks, so that after the metallic bar which is fed by the feed rollers passes through the guideway in the guide blocks, it is adapted to enter the upper portion of the forming socket. As the bar is thrust into the socket it is coiled around the mandrel, and in the initial operation the forward end of the bar is manually bent laterally outwardly as it approaches the deflecting plate, so that in the further feeding movement of the bar, it engages with the beveled face of the plate, and thus a series of spiral coils are formed on the mandrel as shown in Figs. 6 and 8, as the bar is fed forwardly by the rollers 9 and 9'.

As shown in Fig. 2, the mandrel 12 extends transversely through the frame and is adjustably secured therein as by means of a set screw 25. The outer end of the mandrel is halved to form acutting edge or anvil 12 with which the cutting blade 6 on the free end of the cutter arm 5 is adapted to cooperate to squarely cut the bar and sever the completed washers. Preferably the mandrel protrudes a short distance outwardly grooves in which the tool is secured by means of the clamping screws 26.

The free end of the cutting tool is in clined or retracted rearward'from the cutting edge of the tool, so that the end ofthe tool not only immediately clears the severed end of the coil, but permits the sameto be continuously advanced by the feedingmechanism without stopping, checking or reversing the same in the operation of the machine. After one severing operation, the cutting tool progresses continuously by rotation to the next severing operation.

The bar or rod from which the mandrel is formed may be made longer than necessary, so that if the half round anvil on the outer end becomes broken in use, a new one may be formed thereon; and the die block is preferably provided with a forming socket at each end, so that if one end becomes defective, the block may be reversed and its other end employed.

In the operation of the machine, the shafts 7 and 7 are driven by the shaft 2 through the train of gears 8 at a speed so proportioned to the speed of the driving shaft that the rollers 9 and 9 will feed the bar into the die just far enough to form a complete washer during each revolution of the drive shaft. The cutter arm being fixed to the drive shaft will thus operate to sever a completed washer from the coiled bar at each revolution without interfering in any way with the uniform continuous feeding of the bar 11.

I claim:

A machine formaking lock washers and the like, including a mandrel and a coil forming die a rotary shaft in front of and substantially parallel With the mandrel, a guide-way and means in rear of the mandrel for feeding a bar forward to form a coil upon the mandrel, the guide-Way being in a line radiating from the rotary shaft and there being a shearing edge on the mandrel, and a cutting tool radiating from the rotary shaft having a shearing edge 00- operating with the shearing edge of the mandrel for squarely cutting and severing Washers formed on the mandrel.

FRANK KESSEL. 

